[enh] Edit balance in admin

coin/members/admin.py

@@ -74,7 +74,8 @@ class MemberAdmin(UserAdmin):
             'type',
             ('first_name', 'last_name', 'nickname'),
             'organization_name',
-            'comments')}),
+            'comments',
+            'balance')}),
         ('Coordonnées', {'fields': (
             'email',
             ('home_phone_number', 'mobile_phone_number'),